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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '581233a8d712ef624547ef6ce6891ab5e949f6a75f63de1bd03b3db9bc805808' 
  AND token = 'Vr22ls3QGQobR+scD5mG2EZkEi+HVEpass1JBA3Bp+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}